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<DIV><FONT size=2 face=Arial>Hi All,</FONT></DIV>
<DIV><FONT size=2 face=Arial>This is my first post to python-dev so I will
briefly introduce myself: My name is Rob Cliffe and I am a commercial
programmer living in London, UK. I have some 30 years of programming
experience but have only been using Python for a couple of years.</FONT></DIV>
<DIV><FONT size=2 face=Arial>First I want to say what a fantastic language
Python is. It is THE best language for development in my opinion, and a
joy to use.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>My specific issue:</FONT></DIV>
<DIV><FONT size=2 face=Arial>I eventually got my head round decorator syntax and
realised that what came after the <A href="mailto:'@'">'@'</A> was (basically) a
function that took a function as argument and returned a function as
result.</FONT></DIV>
<DIV><FONT size=2 face=Arial>However it seems to me unPythonesque (i.e. an
exception to Python's normal consistency) that the syntax of what follows the <A
href="mailto:'@'">'@'</A> should be restricted to either a single (function)
identifier or a single (function) identifier with an argument list.</FONT></DIV>
<DIV><FONT size=2 face=Arial>The example I tried, which seems not an
unreasonable sort of thing to do, was along the lines of:</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>def deco1(func):</FONT></DIV>
<DIV><FONT size=2 face=Arial> <deco1-suite></FONT></DIV>
<DIV><FONT size=2 face=Arial>def deco2(func):</FONT></DIV>
<DIV><FONT size=2 face=Arial> <deco2-suite></FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>DecoList = [deco1, deco2]</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>@DecoList[0] # NO - CAUSES SYNTAX
ERROR</FONT></DIV>
<DIV><FONT size=2 face=Arial>def foo():</FONT></DIV>
<DIV><FONT size=2 face=Arial> pass</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I am sure other guys have their own
examples.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I am of course not the first person to raise this
issue, and I see that Guido has a "gut feeling" against allowing a general
expression after the <A href="mailto:'@'">'@'</A>.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>BUT - a general expression can be "smuggled in"
very easily as a function argument:</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>def Identity(x): return x</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>@Identity(DecoList[0]) # THIS
WORKS</FONT></DIV>
<DIV><FONT size=2 face=Arial>def foo():</FONT></DIV>
<DIV><FONT size=2 face=Arial> pass</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>So - the syntax restriction seems not
only inconsistent, but pointless; it doesn't forbid anything, but
merely means we have to do it in a slightly convoluted (unPythonesque)
way. So please, Guido, will you reconsider?</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Best wishes</FONT></DIV>
<DIV><FONT size=2 face=Arial>Rob Cliffe</FONT></DIV></BODY></HTML>
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